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Originally Posted by white3ch0c0late
The projector lense has nothing to do with it. The projector lens simply refracts the light. The blue at the top of the cutoff is not created by the lens itself per se. It is cause by a wavelength of light due to an increase in the distance between the bulb and the lens. The bigger the distance, the bigger and bluer the cutoff.
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Different wavelengths of light (different colors) will bend differently in the lenes. In white light, you have a red, green, blue and all the colors inbetween to make up the light. Blue obviously doesn't bend as much in the lenes as the other colors.
